Pressure-gage for tires.



Patented Mar. 4,1919

B. G. GILBOUGH.

. PRESSURE GAGE FOR TIRES.

APPLICATION FILED MAY 23, 1917.

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ress-seasons r012. TIRES.

Specification of Letters Patent.

Application filed May 23. 1917. Serial No. 170,408.

To all whom it may concern: Be it known that I, .BENJAMIN G. GIL- BoUoH, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles, State of California, have mvehted new and Iuseful Improvements in Pressure- Gages for Tires, of which the following is a specification.

This invention relates to pressure gages for tires; and it is a general object of this invention to provide a simple, reliable and easily applied device which maybe applied to a tire and rim to permanently and eontinuonsly-indicate the inflation pressure in the tire.

In a. .co-pending application Serial No. 170,409, filed May 23, 1917, I have explained the general and broad tion and set forth my in this present application I set forth a par t'icular fOlll'l of my device whose distinguish ing feature is tlieuse of the valve stem of the tire as the relatively movable element of the pressure indicator. In general, my in- .vcntion includes two-relativclymovable members, one of which is connected with the tire wall; and the, internal inflation pressure of the l ire moves the wall and the movable eleln'enL in proporl ion t'olhe inflation pressure. In my said co-pending application Serial No. 170,40 liled May 23, relatively movable elements which mcrel bear against the exterior surface of the tire wall (the inner tube of the tire); and that is one specific form of my invention. In the present specific form of my invention I utilize the al tire, opposed a spring. This valve stem is of course, permanently secured and attached to the inner tube of the, lire. 'l t is'a particular advan lagc of the present specific form that it is only necessary to supply a few single parts which are assembled and used in connection with the valve stem.

in. the. following specification I describe in detail said specific form of device emvention; referring for this claims thereto; and

. purpose to the accompanying drawings, in

This

Figure l is a view showing my device in elcvalion; and Fig.2 is a view shaving .my device ,in section, appli d to a rim and tire. ll. will be understood that the drawngS are about twicc'lhe actual Size of the aspects of my inven- 10. Thus it will 1917, I have shownways preseht valve stem of the in its movement preferably by Patented M ar. 4, i919.

device; and that my device is in reality quite sme In the drawings I show a rim 10. This rim may typify any kind of rim, whether a detachable rim or the rim of a demount= able wheel. As will be understootli my de.-- vice may be applied to anykind o rim or wheel, or fell or the 1ihe. The inner tube of a tire is shown at ii and the usual valve stem is shown at 12 head 12 on-its inner end inside the tube 1.1; and a net or similar means, as shown at 12", holds the valve stem in rigid and permanent connection with the the wall (the innertnhe wall). For the purposes of my invention I lit a sleeve 13 around the valve stem. This sleeve has a shoulder at it which bears against the upper surface of the stem not 12"; and it has a curved flange surface at in against which the inner lube wall 11, or a protector strip ll, is adapted lo helm v 'lhe inner end (lhe end of the sleeve or tube 13 toward the tire) has a flange 16 which carries one end of the spiral spring 11', the other end of this sprint? resting against the rim as seen that the spring 17 is confined between the rim and the rela- The valve simulate a tively movable element of the gage indicator; the relatively movable element being,

in this case, primarily but in actual fact the valve stein 12 and the sleeve 13. Sleeve '13 is provided mainly for the purpose of providing a smooth exterior sliding surface for the relatively movable element and also to provide a surface on which the pressure indications l8-ma'y be readily placed. The protector strip 11 provents the inner tube from coming into direct contact with the spring 17 and the other parts. The tube.13 is held in place by aunt 1!) which screws down onto the upper end of the tube 13 engaging the screw threads of the, valve stem; and this nut also serves Jlhc purpose of forming a limit stop for the downward movement of the tube 13 and the valve stem, the nut striking the end of extcrior sleeve 20.

The movable. lube l3 slides in an exterior sleeve 20, rigidly mounted upon the. rim Hi. This sleeve 20 may have a llange 21 at its inner end; and a nut. QJscren's downon screw thrcmls 23 and bears against the rim 10 (ll bears against a washer 2i against the rim. The. upper end of the sleeve 30 becomes a-conn-nient mark by which the press-ere the valve stem 12,

designations 18 ontube 13 may be read. The whole device is inclosed within a cap 25,

havinga window or windows 26 through The effective pressure area borne and carried tionto the rim, means for indicating theengigesahef wall, embodying 'a resilient member confined between the tire wall and lieve my invention to be broad by the spring 17 is determined by the size of theindentation into the tire caused by the spring; and this effective pressure area being 'known, and the strength of the spring being known, the pressure designations 18 maybe fixedaccordingly. The device then continuously and accurately indicates the internal inflation )ressure in the tire; utilizing, like the specific forms'described in my said copending application Serial No. 170,409, filed May 23, 1917, the externaloutward pressure of the tire wall, In the present specific form of device it is not necessary to makean additional hole through the rim upon which the tire is mounted; mydeviee being accommodated by the usual valve stem opening through the rim, or by a slight enlargement of that opening. The device may be applied to the valve stem of any tire; it is only nccessary to apply the extra parts herein de scribed. v v I Within the limitations herein indicated and set fnrthby the tollowin claims, I be in its nature and scoperand I thereforedo not limit myself to specific details of structure 'and design, as, these may be varied without departing from my invention. Having described a invention, I claim:

1. In combination with a rim and an in fiatable tire thereon, a member engaging the tire wall and movable therewith with relaamount of said relative movement, and resilient means to resist movement of said member and of the portion of the tire wall surrounding the place where said member the riurai'id substantially conical in formation with its larger end at the rim. c

2. In combination with a rim :and an inpreferred form of my fiatable tire thereon,)a member engaging the spring having its larger on at the rim and its smaller end near .theplace where said ,member engages the tire wall, and a protecfin' piecebetween the spring and the tire -wa In combination with arim and an infiatable' tire thereon, a member extending and movable rad ial'ly through the rim with its inner end engaging the tire wall and .movableby the inflation of the tire, means to indicate the amount of movement of said I member, and a cone shaped spring surround. ing the movable member. and lying. between the tire wall and the;rim"t0 support said member and thesurroundin'g' portion of the, 'tire wall and'resistinflatmn movement of said memberand the surrounding portion of the tire wall.

4. In combination-with rini and an inflatable tire thereon, a valve-stem attached to the tire wall and extending an'd movable radially through the rim, ,a sleeve surroundmg and mounted onthevalve stem to move therewith, a sleeve mounted on thernn and through which the valve-stem sleeve extends and slides, and a springisurrounding the valve-stem sleeve! andxrbfifined' between the v rim and theend'ofithe sleeve at the tire wall.

j In combinationwith a. rim and an infiatable tire thereon,' avalve-stem attached to the tire wall andnextending and movable radially through, the 'rirn, a' 'sleeve surrounda in g and mountedl onthe valve stem: to move therewith, a sleeve mountedionitherim and through whichthe-valve-stem sleeve extends and slides, andacone shaped spring. surrounding the. valve stem sleeve and confined between the rim and the end of the sleeve at the tire wallfthe' larger end of the spring being at the rim, .whereb .said valve-stem ion and its sleeve and also t e portion of the tire wall surrounding the valve stem are resiliently supported against inflation movement, a a

In witness that I claim the foregoing I have hereunto subscribed my name this 11th day of May, 1917,

, N AMIN o GILBOUGH. 

